Concerning this (unfortunately locked) topic: http://forum.mikrotik.com/t/romon-troubleshooting/127466/1
I was able to solve ROMON issue described in above mentioned topic by comment from AndreyRa on UBNT forum: https://community.ui.com/questions/ES-24-250W-and-Mikrotik-RoMON-failure/0b963b54-d77b-44dc-aec3-7c41c5b51bc3#answer/a65916d0-a7a8-4e4c-bdce-f33159f05bc4
On Ubiquity Edgeswitch 24 with no VLANs issue from cli (ssh):
enable
configure
mac access-list extended global
permit any any
exit
mac access-group global vlan 1 in
Tested on EdgeSwitch 16 150W firmware v1.9.3
Hope this helps to someone.